【判断题】We had no idea at all. He told us he was leaving the company. Was the news out of the blue?
【单选题】The news had no _______ on her.
【单选题】The news had no ______ on her
【单选题】The news had no on her at all.
【简答题】科学史上被称为“有学问人中最富有,有钱人中最有学问者”的是 。
【判断题】序列x(n) = sin(3πn/4) + cos(0.5πn)是周期序列。